机构地区: 中山大学化学与化学工程学院物理化学研究所
出 处: 《中国有色金属学报》 1998年第4期663-667,共5页
摘 要: 利用线性扫描伏安法研究了Yb(Ⅲ)在等摩尔NaClKCl熔体中Cu电极上还原的电化学行为及扩散系数。结果表明:Yb(Ⅲ)第一步可逆还原为Yb(Ⅱ),Yb(Ⅱ)进一步还原并与Cu形成合金:Yb3++e=Yb2+,Yb2++2e+nCu=YbCun。测定了Yb(Ⅲ)和Yb(Ⅱ)在973KNaClKCl熔体中的扩散系数分别为1.5×10-5和1.0×10-5cm2·s-1。用自耗阴极法在1123K,阴极电流密度20A·cm-2。 Linear sweep voltammetry has been used to study the redox of Yb(Ⅲ) in equimolar NaCl KCl melt on the Cu cathode. It is reasonable to presume that the reduction of Yb(Ⅲ) to Yb(Ⅱ) is reversible on Cu electrode at first step and Yb(Ⅱ) is reduced to form alloy with Cu on Cu electrode surface: Yb 3+ +e=Yb 2+ , Yb 2+ +2e+ n Cu=YbCu n . The diffusion coefficients of Yb(Ⅲ) and Yb(Ⅱ) in NaCl KCl melt at 973 K are 1.5×10 -5 and 1.0×10 -5 cm 2·s -1 , respectively. The Yb Cu alloy was prepared by consumable cathode in molten chlorides. The Yb Cu alloy contains about 15% of Yb.